The 6dFGS peculiar velocity field

Christopher M. Springob, Christina Magoulas, Matthew Colless, D. Heath Jones, Lachlan Campbell, John Lucey, Jeremy Mould, Pirin Erdoğdu

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


The 6dF Galaxy Survey (6dFGS) is an all-southern-sky galaxy survey, including 125,000 redshifts and a Fundamental Plane (FP) subsample of 10,000 peculiar velocities. This makes 6dFGS the largest peculiar-velocity sample to date. We have fitted the FP with a tri-variate Gaussian model using a maximum-likelihood approach, and derive the Bayesian probability distribution of the peculiar velocity for each of the 10,000 galaxies. We fit models of the velocity field, including comparisons to the field predicted from the redshift-survey density field, to derive the values of the redshift-space distortion parameter β, the bulk flow and the residual bulk flow in excess of that predicted from the density field. We compare these results to those derived by other authors and discuss the cosmological implications.
Original languageEnglish
Title of host publicationAdvancing the physics of cosmic distances
Subtitle of host publicationproceedings of the 289th Symposium of the International Astronomical Union held in Beijing, China
EditorsRichard de Grijs
Place of PublicationCambridge
PublisherCambridge University Press
Number of pages5
ISBN (Print)9781107033788
Publication statusPublished - 2013
Externally publishedYes
EventInternational Astronomical Union Symposium (289: 2012) - Beijing
Duration: 27 Aug 201231 Aug 2012

Publication series

NameIAU Symposium No. 283
PublisherCambridge University Press
ISSN (Print)1743-9213


ConferenceInternational Astronomical Union Symposium (289: 2012)


  • surveys
  • galaxies: distances and redshifts
  • cosmological parameters
  • large-scale structure of universe

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